Thermo Scientific BF51728, Installation And Operational Manual

Page: 22 / 81

1100°C Box Furnace 330985H01 | 4-21
Installation |
Chapter 4
Figure 4 Preventing Chimney Effect
Atmosphere Inlet
All Moldatherm box furnaces have a factory-installed air/atmosphere inlet.
Most inert atmospheres (i.e. nitrogen, argon, and helium) can be safely run in this box
furnace. However, maximum temperatures may be derated depending on atmosphere. An
initial burn-in period in air is recommended.
Please contact Thermo Fisher Scientific prior to using the furnace with an inert
atmosphere.
The furnace should run for 7 to 10 hours at 1100°C before using an inert atmosphere and
after every 60 hours of use with an inert atmosphere. This burn in process will help
remove contaminants and provides a protective oxide layer on the heating elements.
This furnace is not designed to be a gas-tight atmosphere furnace.
Atmosphere Inlet Port
The atmosphere inlet tube assembly has been packaged separately to avoid breakage
during shipping and handling.
Even if you do not intend to use the gas inlet, you must install the assembly before
operating the furnace. The only tool you need is a Phillips head screwdriver.
To install the atmosphere inlet tube assembly:
1. Carefully remove the assembly from the package and inspect for any damage.
2. Remove the two mounting screws from the rear housing panel of the furnace.
3. Insert the ceramic tube end through the access hole in the rear of the furnace and
guide the tube into the back of the chamber.